From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: pjb@informatimago.com (Pascal J. Bourguignon) Newsgroups: gmane.emacs.help Subject: Re: system-command-exists-p Date: Mon, 07 Dec 2009 11:13:10 +0100 Organization: Informatimago Message-ID: <87bpibf5xl.fsf@galatea.local> References: NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1260182795 27850 80.91.229.12 (7 Dec 2009 10:46:35 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 7 Dec 2009 10:46:35 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Mon Dec 07 11:46:28 2009 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1NHb6q-00080q-25 for geh-help-gnu-emacs@m.gmane.org; Mon, 07 Dec 2009 11:46:28 +0100 Original-Received: from localhost ([127.0.0.1]:33660 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NHb6p-0002cu-Hu for geh-help-gnu-emacs@m.gmane.org; Mon, 07 Dec 2009 05:46:27 -0500 Original-Path: news.stanford.edu!usenet.stanford.edu!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 39 Original-X-Trace: individual.net nfpJITy6Hw47vKQ7wJMipwcX+lbdNh6VH1IJYfANMjngJEb31u Cancel-Lock: sha1:YTQ0Y2YxZGFjMGE3Y2UzMjY3Yzg5MTYzMDhmNTgzZWFiYTJhN2Q2Nw== sha1:7PC4UCkyML6EU+dv0rcT+Yi6EeU= Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwAQMAAABtzGvEAAAABlBMVEUAAAD///+l2Z/dAAAA oElEQVR4nK3OsRHCMAwF0O8YQufUNIQRGIAja9CxSA55AxZgFO4coMgYrEDDQZWPIlNAjwq9 033pbOBPtbXuB6PKNBn5gZkhGa86Z4x2wE67O+06WxGD/HCOGR0deY3f9Ijwwt7rNGNf6Oac l/GuZTF1wFGKiYYHKSFAkjIo1b6sCYS1sVmFhhhahKQssRjRT90ITWUk6vvK3RsPGs+M1RuR mV+hO/VvFAAAAABJRU5ErkJggg== X-Accept-Language: fr, es, en X-Disabled: X-No-Archive: no User-Agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/22.3 (darwin) Original-Xref: news.stanford.edu gnu.emacs.help:175394 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:70469 Archived-At: Andreas Roehler writes: > Hi, > > needed a check if a command exists on system. > Employed the following: > > (defun system-command-exists-p (command) > "Return t if COMMAND is available on system. " > (let* ((cmd (format "type %s" command))) > (eq 0 (shell-command cmd)))) > > Any comments/suggestions? Use %S or (shell-quote-argument command). type is a built-in command specific to the sh familly of shells. Perhaps it would be a good idea to explicitely call up sh? It may be useful to return the path of the command: (defun system-command-exists-p (command) "Return t if COMMAND is available on system. " (let* ((cmd (format "/bin/sh -c 'type %s'" (shell-quote-argument command)))) (when (eql 0 (shell-command cmd)) (let ((result (shell-command-to-string cmd))) (if (string-match "^.* is \\(.*\\)\n$"result) (match-string 1 result) result))))) (mapcar (function system-command-exists-p) '("cat" "type" "foo")) --> ("/bin/cat" "a shell builtin" nil) -- __Pascal Bourguignon__